CVE-2020-8192 Denial of service in fastify
Attackers can cause resource exhaustion and denial of service in Fastify applications using the allErrors option via crafted schemas.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8192?
CVE-2020-8192 is a medium-severity denial of service vulnerability in fastify, published on 30 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A denial of service vulnerability exists in Fastify v2.14.1 and v3.0.0-rc.4 that allows a malicious user to trigger resource exhaustion (when the allErrors option is used) with specially crafted schemas.
Weakness: CWE-400
Which versions are affected by CVE-2020-8192?
2 open source packages ship an affected version, including fastify. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fastify npm | All versions | 2.15.1 |
fastify npm | All versions | 2.15.1 |
Products include Fastify Fastify.
How do I fix CVE-2020-8192?
Upgrade fastify to 2.15.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-8192 being exploited?
There is no known exploitation of CVE-2020-8192 in the wild and no public exploit code.
Other vulnerabilities in fastify
- CVE-2026-84504 fastify vulnerable to request body replacement via an async validation result collision
- CVE-2026-76169 fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers
- CVE-2026-84428 fastify vulnerable to header validation bypass via incomplete schema case normalization
- CVE-2026-84469 fastify vulnerable to request validation bypass via skipped boolean false schemas
- CVE-2026-33806 fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header
Sources
Also known as GHSA-xw5p-hw6r-2j98.